medical Definition of hydration
1
:the act or process of combining or treating with water: as
a
:the introduction of additional fluid into the body
- hydration sometimes helps to reduce the concentration of toxic substances in the tissues
b
:a chemical reaction in which water takes part with the formation of only one product
- hydration of ethylene to ethyl alcohol
2
:the quality or state of being hydrated;
especially
:the condition of having adequate fluid in the body tissues
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